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https://issues.apache.org/jira/browse/HDFS-13124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16372593#comment-16372593
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Jianfei Jiang commented on HDFS-13124:
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Also meet this problem in 3.0. In the code of trunk, the sleep time seems to
have been changed to 1s, but the balancer is still too quick to get a ps
result. The related code is in
{{haddop-functions.sh#hadoop_start_daemon_wrapper}}.
{code:java}
sleep 1
# capture the ulimit output
ulimit -a >> "${outfile}" 2>&1
# shellcheck disable=SC2086
if ! ps -p $! >/dev/null 2>&1; then
return 1
fi
return 0
{code}
> hadoop-daemon.sh exits with 1 when running HDFS balancer on balanced cluster
> ----------------------------------------------------------------------------
>
> Key: HDFS-13124
> URL: https://issues.apache.org/jira/browse/HDFS-13124
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover, scripts
> Affects Versions: 2.7.3
> Reporter: Zbigniew Kostrzewa
> Priority: Minor
>
> When running HDFS balancer via {{sbin/start-balancer.sh}} script on a
> balanced cluster the script exits with 1 though the CLI behind it (i.e.
> {{hdfs balancer}}) exits with 0. This is probably caused by following piece
> of code found in {{hadoop-daemon.sh}}:
> {code:java}
> sleep 3;
> if ! ps -p $! > /dev/null ; then
> exit 1
> fi
> {code}
> It seems the CLI command finishes so quickly in case of a balanced cluster
> that the above {{ps}} does not find it.
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